Regarding the case studies I wonder whether one of them covers the following (I haven’t been able to find this): data are species observations from inventories, van have a varying degree of standardisation, in common though data are event-based. In common also is that species observations are collected using a protocol that uses a species checklists (potentially even different checklists depending on for example observer experience/knowledge). Hence, by knowing the checklist absences can be inferred. For each event there is therefore a linked checklist (could be the same checklist for all events contained in the same dataset, or different checklists for different events). The checklist may either be published standalone (and then be linked to the event) or could be included in the publishing model. Specifically I wonder whether the Grand unified model could cover such linked checklists, I would see this as information related to Protocol.